Drilling or boring tool.



W. M. TREGLOWN W. NOBLE.

DRILLING 0R BORING TDOL.

APPLlcATloN FILED mm. 21. |912.

Patented J an. 25, 1916.

Inven to1s Attorney @L Wtneasesl i regulation of the b Relat' rock, to increase1 the drilling `effect the release of the dri ositions around t mm IAINETBEGLOWN AND NOBLE, 0F LONDON, ENGLAND, ASSIGNOBS T0 INGEBSOLL-BAFD OOMPANY, 0F J'EBBEYVCITY, NEW JERSEY, A @EPURATION Specification of Letters Patent.

DRILLING 0B BORING TOOL.

Patented Jan. 25, 1916.

Application ined Burch 21, 191B. Serial No. 886,282.

residin at 165 Queen `Victoria street, London, C., England enneers, have 1nvented certain new an use l Improvements to Drilling or Boring Tools, of which e following is a specification.

This invention relates to drilling or boring tools and especially to rcussive hammer drills and the like, and 1t has for its ob' ject to provide sim le means to effect the ow and stroke of the machine and t e eriodic removal of the loose chips or d bris from' the drill or bore hole, so as to e a clear working face of capacity1 or to ling too when this may have become bound in the hole.

According to the invention we provide on the exhaust, a, valve or other device by means of which the piston of the drill may be prevented froin operating er may be controlled in such l manner as to perform its strokes in the cylinderbut without striking blows, to eEect rotation, and by which air or other motive iluid may be caused to ass through the ports and through the holow drill .toolz so that any accumulation of chips or debris in the bore ordrill hole is expelled under the relatively hi h pressure and volume of aix' passing throng by which the binding of the drill tool in the drill or bore hole is avoided or overcome.

The invention is illustrated in the accompan ng drawilgs as applied to a hammer of standar t'p'e Figure 1 is an e ovation of the -drill taken at right angles to Fig. 2 showing the position of the valve by which the exhaust is throttled. Fig. 2 is an elevation in section of the drill, taken on a plane intersecting the valve box, the air passages in the cylinder being shown displaced from their actual e eriphery of the cyliner to facilitate the escnption of the operation. h

In carrying the invention into effect in its application to a percussive drill of the construction illustrated in the drawings there is mounted upon the exhaust outlet a of the valve casing a a plug valve b by which the 'regulated to a line the compressed passage of the exhaust air may be throttled to any desired degree so that the force of the blow given by the piston to the drill may be degree or so that the piston merely reciprocates for the urpose of e'ectingrthe rotation of the dril or is prev ented om operatin while the compressed air 1s caused to ass t rough the inlet rts of the drill and t rough the hollow drillmtool for the expulsion of any accumulation of debris in the bore or drill hole. y

In the operation of the drill illustrated in the drawing, when the valve a is in its lowermost position and the piston f is in its uppermost position the lower inlet passage d d1 to the valve chamber communicates with the corresponding valve exhaust passage g through the assae d and the annu ar space fl forme by t e reduced middle portion of the piston, while the valve exaust assage Il is closed by the lower portion oi) the piston and the valve c is therefore under the ressure of the compressed air or other motive fluid entering by the upper inlet passa e e e1. The valve is thus retained in its owermost position and the air or other motive liuid enters the piston cylinder by the upper inlet passage i.

Part of the compressed air acting upon piston f is free to pass between the teeth of the piston rifle nut f" and the grooves of the rifle bar j and down the bore fa of the piston to the hollow drill tool k and thus to the drill hole. Similarly air can pxass from the annular cylinder space below t e lower portion of the piston between the rotation sleeve nut l and the central rolongation of the piston. By means of t e ratchet device m secured to the rifle bar j the piston is prevented from rotating and thus the drill k is rotated.

As the piston f passes down to give the blow upon the dril k, the air in the lower annular cylinder space is -free to exhaust through the lower inlet `passage n and in the travel of the reduced midd e portion of the piston the upper valve inlet passa e e1 is put into communication with the va ve exhaust passage h through the passage e2 and the annular space f while the lower valve exhaust passage y is closed and the valve thus becomes open to the pressure of the air entering theV valve inlet passage d d. The

valve, therefore, rises and air is admitted to the cylinder by the lower inlet passage n while the upper inlet passage i is thrown open to the exhaust. The piston then rises and partially rotates the ratchet device fm. to a new position.

The air is admitted to the valve box by the inlet al while the exhausts both from the cylinder and the valve box pass out by the exhaust outlet ai to which the valve b is applied.

lt will be evident that during the operation of the drill a small amount of air will pass through the passage f3 from the back of the cylinder during the forward stroke of the piston to the hollow drill steel, likewise, a certain amount will pass from the forward end of the cylinder around the central prolongation of the piston to the drill steel during the backward stroke of the piston. This, however, is not suflicient to keep the hole clean at all times. When it is desired to thoroughly clear out the hole the valve I) is closed, or almost closed, with. the result that the only exit from the cylinder is through the drill steel, whether by way of the passage f3, or around the central dprolongation of the piston. It will be evi e t therefore, that no matter what position the piston happens to be in when the exhaust valve is closed, the air from the cylinder will pass to the drill steel and blow out the rock cuttings from the hole.

Instead of thus controllin the exhaust we may cause the same eifectluy permitting the compressed air or other motive fluid to travel direct to the drilling tool; and we may, for example, provide a common valve for the supply of the motive fluid which in one position may admit the motive fluid for the operation of the tool, while in another position it may com letely close the su ply of the motive fluid or the operation o the tool, and in yet another position it may admit the motive fluid for the removal of the chips or debris from the drilling or boring hole for the purpose described. It will however be understood that a separate valve may also be used for the removal of the chips or debris. By such means it will be understood that the drill hole is readily cleared from time to time to prevent the accumulation of' chips or debris without the necessity of' the removal of the drill or its separation from the drilling` or boring tool.

The invention is not limited to the particular form of controlling valve that may be employed, but we prefer to provide a valve which is provided and disposed so as to be easily operable by the driller.

It will be understood also that the invention is not limited to the particular application hereinbefore described, but is applicable to all kinds of neumatic or like tools for the regulation of) the operation and in the case of the tools provided with several exhaust outlets each of these ma be provided with a separate throttle va ve.

What we claim as our invention and desire to secure by Letters Patent is 1. In a pneumatic percussive drill, a cylinder, a piston, a hollow drill steel actuated by said piston, passages for conveying fluid from both ends of said cylinder to the bore of said steel, and means for throttling the exhaust of the drill.

2. In a pneumatic percussive drill, a cylinder, a piston, a hollow drill steel actuated by said piston, a passage through said piston to convey fluid to said drill steel from the rear end of said cylinder, means to convey fluid from the front end of said cylinder to said drill steel, and means for throttling the exhaust from said cylinder.

3. The combination in a pneumatic tool of means for the passage of live fluid from the rear of the working piston directly to the bore of a hollow drill or cutter carried by the tool for the purpose of removing debris from the working face and means for throttling the exhaust from the tool for the control of the operation of the tool and of the flow of live fluid for the removal of the debris from the working face, substantially as described.

4. A pneumatic tool comprising a cylinder havmg ports for the admission and exhaust of fluid, a piston within said cylinder, a hollow drill or cutter carried by the cylinder, means for the direct passage of live fluid from the rear of the piston to the bore of the hollow drill or cutter, means for the control of the admission and exhaust of fluid to and from the fore and rear ends of the piston and means for throttling the exhaust from the tool substantially as described.

5. y A pneumatic tool comprising a cylinder having ports for the admission and exhaust of fluid, a piston within said cylinder having a longitudinal passage or small cross-section, a hollow drill or cutter carried by the cylinder, means for the control of the admission and exhaust of fluid to and from the fore and rear ends of the piston for the operation of the piston, and means for throttling the exhaust from the tool, substantially as described.

6. A pneumatic tool comprising a cylinder, a drill or cutter holder mounted upon the cylinder, a piston within the cylinder having a central prolongation extending into the drill or cutter holder, a longitudinal passage of small cross-section throu h said pist0n and prolongation, a hollow drill or cutter carried by the drill or cutter holder, means for the control of the admission and exhaust of fluid to and from the cylinder at each end of the piston for the operation of the piston, and means for throttlng the exhaust from the tool, substantially as described.

7 A neumatic tool comprising a cylinder, a` rill or cutter holder mounted upon the cylinder, a piston within the cylinder having a central prolongation extendin into the drill or cutter holder, a longitudina passage of small cross-section through said piston and prolongation, a hollow drill or cutter carried by the drill or cutter holder, a valve box connected with the cylinder by admission and exhaust ports, a valve in the valve box controlling the passage of the uid to and from the cylinder and means for throttling the exhaustfrom the tool, substantially as described.

8. A pneumatic tool comprisin a cylinder, a rotatable drill or cutter hol er mounted upon the cylinder, a piston within the cylinder having .a prolongation extending into the drill or cutter holder and engaging it by surface grooves inclined to the axis, a rotatable ratchet device at the head of the cylinder with an axial stem having slidable con nection with the piston, a longitudinal passage of small cross-section through said piston and prolongation, a hollow drill or cutter carried by the drill or cutter holder, a valve box connected with the cylinder by admission and exhaust ports, a valve in the valve box controlling the passage of the fluid to and from the cylinder and means for throttling the exhaust from the tool substantially as described.

In testimony whereof We have hereunto signed our names to this specification in the presence` of two subscribing witnesses.

WILLIAM MAINE TREGLOWN. WILLIAN NOBLE. Witnesses:

Ronn'r OWEN HUGHES, O. J. WORTH.

valve box controlling the passage of the fluid to and from the cylinder .and means for throttling the exhaust from the tool, substantially as described. v

8. A pneumatic ,tool comprising a cylinder, a rotatable drill or cutter holder mounted upon the cylinder, a piston within the cylinder having .a prolongation extending into the drill or cutter holder and engaging it by don, England, for an improvement in Patient ce.

Enters this disclaimer-y to wit:

[Ojcial Gazette J ul'y 17, 1.917.]

in .the printed specification requiring correction a 5, for the WO1-d or read of; and that the said Letters Patent should le'ad'with` this correction therein that the same may conform to the record of the case in surface grooves'inclined to the axis, a rotatable ratchet device at the 'head lof the cylinder with an axial stem having slidable connection with the piston, a longitudinal pas- `sage of small cross-section through said piston and prolongation, a hollow drill or cutter carried by the drill or cutter holder, a valve box connected with the cylinder by admission and exhaust ports, a Valve in the valve box controlling the passage of the Huid to and from the cylinder and means for throttling the exhaust from the tool substantially as described.

Intestimony whereof we have hereunto .i

signed our. names to this specification in the presence of two subscribing witnesses. I

WILLIAM MAINE TREGLOWN. WILLIAN NOBLE. .Witnesses: f

ROBERT OWEN HUGHES, p O. J. WORTH.

d that in Letters'Paten't No. 1,169,582, granted January 25, i William MeineTreglown and `William Noble, of Lon- Drilling or Boring `To0ls,"'an error appears s'followsziiage 2, 111, claim the signed mm1 sealed this 31st day of Ju1y,A.D 1917. y

i DISCLAIMER.

1,169',582.`-W11llfm Maine T reglowu and William Noble, `London, England. 'DRILLLING 0R BORING TooL. Patent dated January-2 5, 19,16. Disclaimer filed June 26, 1917, by the assignee, Ingersoll-Rand Company. i

To that part of the claims in said specification'which is in the following Words,

1.In a pneumatic percussive drill, a cylinder, a piston, a hollow drill steel actuated by said piston, passages for conveying fluid 'from both ends of said cylinder to the bore of said steel, and means for tlirottlingthe exhaust of the drill.l

DIS GLAIMEB.

1,169,582.Wllliam Maine Treglown and William Noble, London, England.

DRILLLING on BORING TooL. Patent dated January 2.5, 1916. Disclaimer filed June 26, 1917, by the assignee, Ingersoll-Rand Company.

Enters this disclaimer- To that part of the claims in said specification which is in the following Words,

to wit:

"l, In u pneumatic percussive drill, a cylinder, n piston, a hollow drill steel actuated by said piston, passages for conveying fluid from both ends of said cylinder t-o the bore of said steel, and means for throttling the exhaust 0f the drill.

[Ojclal Gazette July 17, 1917.]

It is hereby certified that, in Letters Patent No. 1,169,582, granted January 5l 1916, upon the application of William Maine Treglown and William` Noble, of London, England, for an improvement; in Drilling or Boring T0ols,"""an error appel,

in the printed specification requiring correction as follows: :Page 2, line 111, claim s, for the word "ow md of; and than the said Leiten; Patent should i ma with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 31stI day of July, A. D., 1917. 

